French Onion Soup Gratinee by cpeirson


4 tablespoons butter 1 teaspoon salt 2 large red onions, thinly sliced 2 large sweet onions, thinly sliced 1 (48 fluid ounce) can chicken broth 1 (14 ounce) can beef broth 1/2 cup red wine 1 tablespoon Worcestershire sauce 2 sprigs fresh parsley 1 sprig fresh thyme leaves 1 bay leaf 1 tablespoon balsamic vinegar salt and freshly ground black pepper to taste 4 thick slices French or Italian bread 8 slices Gruyere or Swiss cheese slices, room temperature 1/2 cup shredded Asiago or mozzarella cheese, room temperature 4 pinches paprika


